DTC B2558 Interior Lamp Control Output Short to Battery. Chevrolet PJJ 2000

For 1990-2009 cars
Lighting Systems Components
Coupe

### Circuit Description

The interior lamps consist of the dome lamp, courtesy lamps and the rearview mirror reading lamps. Battery voltage for the interior lamps is supplied by the BCM through the inadvertent power relay output (circuit 1732) which is internal to the BCM. The interior lamps are controlled by the body control module (BCM) by grounding circuit 156. If circuit 156 becomes shorted to battery voltage, DTC B2558 sets.

### Conditions for Running the DTC

At least one of the following conditions must exist:

• | At least one door is open.

• | The interior lamps are commanded on by the BCM.

### Conditions for Setting the DTC

• | The interior lamps are commanded on by the BCM.

• | The interior lamp control circuit (156) is shorted to battery positive voltage for 125 milliseconds.

### Action Taken When the DTC Sets

• | DTC B2558 is stored in the BCM memory.

• | The BCM disables the interior lamp control output for the remainder of the ignition cycle.

### Conditions for Clearing the DTC

• | A current DTC B2558 will clear when the malfunction is no longer present and the ignition switch is cycled.

• | All BCM history codes clear after 100 ignition cycles with no current codes active within the 100 ignition cycles.

### Diagnostic Aids

If the DTC is a history DTC, the problem may be intermittent. Try performing the tests while wiggling the wiring and connectors. This can often cause the malfunction to appear.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. The normal state of the INTERIOR LAMP OUTPUT parameter with a door open is ON.

2. The normal state of the INTERIOR LAMP OUTPUT parameter with all doors closed is OFF.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | Go to A Diagnostic System Check - Lighting Systems

2

1. Open the right front door.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the INTERIOR LAMP OUTPUT parameter in the LAMP STATUS data list.

Does the scan tool display ON?

Go to Step 3

Go to Step 4

3

1. Close the left front door.
2. With the scan tool, observe the INTERIOR LAMP OUTPUT parameter.

Does the INTERIOR LAMP OUTPUT parameter change state?

Go to Testing for Intermittent and Poor Connections in Wiring Systems

Go to Step 4

4

1. Ensure that the right front door is open.
2. Turn OFF the ignition.
3. Disconnect the following components:

• | Dome lamp

• | Left and right courtesy lamps

• | Rearview mirror reading lamps (if equipped)

4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the INTERIOR LAMP OUTPUT parameter.

Does the scan tool display ON?

Go to Step 7

Go to Step 5

5 | Test the signal circuit of the interior lamps for a short to battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6
6 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8
7 | Inspect for poor connections at the harness connectors of the interior lamps. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9
8 | Important: Perform the setup procedure for the BCM. Refer to BCM Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 10 | --
9 | Replace the appropriate interior lamp or connector. Did you complete the replacement? | Go to Step 10 | --

10

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK